fix: prevent pipeline freezes when sending endframe (#77)

* fix: dont cancel task if call is already ending

* Update pipecat

api/services/workflow/pipecat_engine.py

@@ -81,6 +81,7 @@ class PipecatEngine:
         self._workflow_run_id = workflow_run_id
         self._initialized = False
         self._client_disconnected = False
+        self._call_disposed = False
         self._current_node: Optional[Node] = None
         self._gathered_context: dict = {}
         self._user_response_timeout_task: Optional[asyncio.Task] = None
@@ -182,7 +183,9 @@ class PipecatEngine:
         async def transition_func(function_call_params: FunctionCallParams) -> None:
             """Inner function that handles the node change tool calls"""
             logger.info(f"LLM Function Call EXECUTED: {name}")
-            logger.info(f"Function: {name} -> transitioning to node: {transition_to_node}")
+            logger.info(
+                f"Function: {name} -> transitioning to node: {transition_to_node}"
+            )
             logger.info(f"Arguments: {function_call_params.arguments}")
             try:
 
@@ -472,6 +475,15 @@ class PipecatEngine:
         Centralized method to send EndTaskFrame with metadata including
         call_transfer_context and call_context_vars
         """
+        if self._call_disposed or self._client_disconnected:
+            # Call is already disposed and client disconnected
+            logger.debug(
+                f"Not sending EndFrame since call is already disposed: Call Disposed: {self._call_disposed} Client Disconnected: {self._client_disconnected}"
+            )
+            return
+
+        self._call_disposed = True
+
         frame_to_push = CancelFrame() if abort_immediately else EndFrame()
 
         # Customer disposition code using their mapping
@@ -700,10 +712,14 @@ class PipecatEngine:
         """Accumulate LLM text frames to build reference text."""
         self._current_llm_reference_text += text
 
-    async def handle_client_disconnected(self):
+    def handle_client_disconnected(self):
         """Handle client disconnected event."""
         self._client_disconnected = True
 
+    def is_call_disposed(self):
+        """Check whether a call has been disposed by the engine"""
+        return self._call_disposed
+
     async def get_call_disposition(self) -> Optional[str]:
         """Get the disconnect reason set by the engine."""
         if self._call_disposition: